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You are standing in line at the super market when a scientist standing behind you strikes up a conversation with you. He tells you that he is running an experiment to try to increase the intelligence of monkeys. He has 20 chimpanzees. He assingned half of them to the treatment group and the other half is living under the same conditions without the treatment as a control. He assigned them to the groups by age, putting all of the older ones in the control group and the younger ones in the treatment group. He is using a two sample z-test to try to prove his theories. (using scores form an intelligence test). As a responsible statician (someone who practices statistics) you feel a need to tell him what he is doing wrong. Explain three things that he is doing wrong ( or that break some statistcal requirement).
A state meat inspector in Iowa has been given the assignment of estimating the mean net weight of packages of ground chuck labeled "3 pounds." Of course, he realizes that the weights cannot be precisely 3 pounds.
a survey of 1373 parents and 1343 students in grades 6-12 regarding the importance of science and mathematics in the
Which statistical analysis technique should be used? What is the null hypothesis? Can an analysis be performed? Why or why not?
a basketball player with a poor foul-shot record practices intensively during the off season. he tells the coach that
Victor Anderson, the owner of Anderson Belts, Inc., is studying absenteeism among his employees. His workforce is small, consisting of only five employees.
The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually.
The following data set shows the ages of the first 7 presidents and the 7 most recent presidents including President Obama. Find the mean, median, and range for each of the two data sets.
At 0.01 significance level is it sensible to conclude that modification reduced number of traffic accidents?
What is the underlying difference between the T-test and the Z-test? Provide an example of nominal information and write a work related survey question that would collect nominal data:
using a normal curve table give the percentages of scores between the mean and a z-score ofa 0.56b 0.57c 1.46d 1.56e
1 assume that adults have iq scores that are normally distributed with a mean of 105 and a standard deviation of 15.
Considering all of the day to day activities you are engaged in at work and in your personal lives, write a 200 (or more) word paper that describes at least three (3) different statistical usages that you see regularly.
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